Shotaro Mamiya (間宮 祥太朗 Mamiya Shōtarō, born 11 June 1993) is a Japanese tarento and actor. He is represented with Tristone Entertainment Inc.

Mamiya's real name is Shotaro Mawatari (馬渡祥太朗 Mawatari Shōtarō) and has nicknames such as "Shotaro" (祥太朗 Shōtarō), "Mamīnu" (まみーぬ, named by Takahisa Maeyama) and Mamitasu (まみたす, nicknamed by Dori Sakurada).